BAT AGN Spectroscopic Survey. XX. Molecular Gas in Nearby Hard-X-Ray-selected AGN Galaxies (original) (raw)

BAT AGN Spectroscopic Survey. I. Spectral Measurements, Derived Quantities, and AGN Demographics

The Astrophysical Journal

We present the first catalog and data release of the Swift-BAT AGN Spectroscopic Survey (BASS). We analyze optical spectra of the majority of AGN (77%, 641/836) detected based on their 14-195 keV emission in the 70-month Swift BAT all-sky catalog. This includes redshift determination, absorption and emission line measurements, and black hole mass and accretion rate estimates for the majority of obscured and un-obscured AGN (74%, 473/641) with 340 measured for the first time. With ∼ 90% of sources at z < 0.2, the survey represents a significant advance in the census of hard-X-ray selected AGN in the local universe. In this first catalog paper, we describe the spectroscopic observations and datasets, and our initial spectral analysis. The FWHM of the emission lines show broad agreement with the X-ray obscuration (∼94%), such that Sy 1-1.8 have N H < 10 21.9 cm −2 , and Seyfert 2, have N H > 10 21.9 cm −2 . Seyfert 1.9, however, show a range of column densities. Compared to narrow line AGN in the SDSS, the X-ray selected AGN have a larger fraction of dusty host galaxies (Hα/Hβ > 5) suggesting these types of AGN are missed in optical surveys. Using the [O III] λ 5007/Hβ and [N II] λ 6583/Hα emission line diagnostic, about half of the sources are classified as Seyferts, ∼ 15% reside in dusty galaxies that lack an Hβ detection, but for which the upper limits on line emission imply either a Seyfert or LINER, ∼ 15% are in galaxies with weak or no emission lines despite high quality spectra, and a few percent each are LINERS, composite galaxies, HII regions, or in known beamed AGN.

Optical and X-ray Properties of the Swift BAT-detected AGN

2010

The Swift Gamma-Ray Burst satellite has detected a largely unbiased towards absorption sample of local (< z >≈ 0.03) AGN, based solely on their 14-195 keV flux. In the first 9 months of the survey, 153 AGN sources were detected. The X-ray properties in the 0.3-10 keV band have been compiled and presented based on analyses with XMM-Newton, Chandra, Suzaku, and the Swift XRT ). Additionally, we have compiled a sub-sample of sources with medium resolution optical ground-based spectra from the SDSS or our own observations at KPNO. In this sample of 60 sources, we have classified the sources using standard emission line diagnostic plots, obtained masses for the broad line sources through measurement of the broad Hβ emission line, and measured the [OIII] 5007Å luminosity of this sample. Based on continuum fits to the intrinsic absorption features, we have obtained clues about the stellar populations of the host galaxies. We now present the highlights of our X-ray and optical studies of this unique sample of local AGNs, including a comparison of the 2-10 keV and 14-195 keV X-ray luminosities with the [OIII] 5007Å luminosity and the implications of our results towards measurements of bolometric luminosities.